374 - Guess Number Higher Or Lower
Written on November 7, 2017
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We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I’ll tell you whether the number is higher or lower. You call a pre-defined API guess(int num) which returns 3 possible results (-1, 1, or 0):
# The guess API is already defined for you.
# @param num, your guess
# @return -1 if my number is lower, 1 if my number is higher, otherwise return 0
# def guess(num):
class Solution(object):
def guessNumber(self, n):
"""
:type n: int
:rtype: int
"""
lo, hi = 1, n
while lo <= hi:
mid = (lo + hi) / 2
res = guess(mid)
if res == 0:
return mid
elif res == 1:
lo = mid + 1
else:
hi = mid - 1
return -1